Embroidering-machine.



K. KELLER. EMBROIDERING MACHINE.

APPLICATION FILED DBO. 5I 1910.

1,031,936. Patented July 9, 1912.

UNTTED TATE PATENT @FFTQE.

KARL KELLER, OF ARBON, SWITZERLAND, ASSIGNOR TO THE FIBMOF ADOLPH SAURER, 0F ARBON, SWITZERLAND,

ET/IBBOIDERING-IIACHIN E.

Application filed December 5, 1910.

T0 (ZZZ whom it may concern Be it known that I, KARL KELLER, a citizen of the Republic of Switzerland, residing at Romanshornerstrasse, Arbon, Switzerland, have invented new and useful Improvements in Embroidering-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appert-ains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention relates to improvements in embroidering machines, and more particularly to an apparatus for imparting an equal rotation to several thread retarding rollers in such machines.

It is known that in embroidering machines a piece of thread for forming a stitch is periodically drawn over each thread retarding roller which rollers are free to turn and are rotated by the thread. While the thread is being drawn off a brake is applied to each roller so that the thread may be drawn off under a desired tension. Vhen several thread retarding rollers are arranged in an embroidering machine itmight occur that the brakes act unequally on the retarding rollers and in consequence thereof the angles through which the rollers rotate and also the pieces of thread drawn off become unequal, which would make the stitches unequal.

The object of this invention is to obtain equal angles of rotation for several thread retarding rollers though the braking action may not be equal with all the rollers. This object is attained positively transmitting the rotary movement of one roller to the other roller.

My improved device is particularly applied for thread retarding rollers which are arranged at different stories of an embroidering machine.

In the accompanying drawings Figure 1 shows in the elevation those parts of an embroidering machine which form the subject of the invention, and Fig. 2 shows a modified form of braking mechanism a and a designate longitudinal parts of the frame of an embroidering machine on which are carried guides for the horizontally movable needle bars Z) and Z) which Specification of Letters Patent.

Patented July 9, 1912.

Serial No. 595,719.

carry needles 0 and c. The needles 0 belong to an upper story and the needles 0 to a lower story of the embroidering machine.

(Z designate the material to be embroid ered. The threads c and c which are drawn through the needles are taken from spools f and f, passed over thread retarding rollers g and g which are free to rotate and provided with roughened surfaces and then pass over take-up levers it and h which are operated in a well known manner. The length of the thread drawn by the retarding rollers depends on the braking action exerted on them. A braking disk 2' is connected to the retarding roller 7 which a brake block Z carried by a double armed lever is is adapted to engage when a connecting rod 91 is moved by means of a lever m. In order to obtain a yielding action of the brake block Z a spring 0 is interposed between the lever on and a collar on the rod 11. The lever m may be fixed in any desired position by means of an are shaped part m having holes into which a pin m passing through a hole in the lever m may be inserted.

In order to positively transmit to the lower roller 9 the pulling action which the thread exerts on the upper roller 9 helical wheels 29, 71' are pr vided which mesh with worms fixed 0n shafts of the thread rollers g, g and are connected by a vertical shaft 1. Any other positive connection might be employed instead of the one shown, nor does it matter which of the thread retarding rollers the brake block Z acts on. The brake may also be adapted to act on the connecting shaft as illustrated in Fig. 2. Fixed on said shaft is a brake block 1 while a second brake block .9 is slidably mounted on the shaft. The block 8 is held against rotation by a fork t which is pivoted to the frame of the machine and engages a flattened part of block 8. The fork t is connected with a lever to on which a lever 41 may act by means of a rod 10. A disk 00 of leather or the like may be placed beween the blocks 1 and s to increase friction.

Owing to the positive connection between the thread retarding rollers all the said rollers will turn through the same angle from which results an equal tension on all the threads and those rollers on which less braking action is exerted are prevented from rotating through greater angles than those on which the braking action is stronger.

Having now particularly described and ascertained the nature of the said invention and in what manner the same is to be performed, I declare that what I claim is:

1. In an embroidering machine, a thread retarding roller for the threads of an upper story, a thread retarding roller for the threads of a lower story, means for positively transmitting the rotary movement of one roller to the other roller, and means for braking the rollers, substantially as shown and described.

2. In an embroidering machine, the conr bination of several thread retarding rollers, a shaft having helical wheels, worms fixed to the rollers and engaging said helical wheels, and means for braking the rollers, substantially as shown and described.

8. In an embroidering machine, the combination of several thread retarding rollers for threads of different stories, a brake disk fixed to one of the rollers, a movable brake block adapted to act on the said disk, and means for positively transmitting to the other thread retarding roller the rotary movement of that roller to which the brake is applied, substantially as shown and described.

4. In an embroidering machine, the combination of several thread retarding rollers for threads of different stories, a brake disk fixed to one of the rollers, a brake block adapted to act on said disk, a spring adapted to press said block on to the disk, a lever adapted to exert pressure on the spring, and means for positively transmititng to the other thread retarding roller the rotary movement of the braked roller, substantially as shown and described.

5. In an embroidering machine, the combination of several thread retarding rollers, a brake disk fixed to one of the rollers, a brake block adapted to act on said disk, a spring adapted to press the block on to the brake disk, a lever adapted to put tension on the said spring, means for fixing said lever in any desired position, a shaft having helical wheels and worms fixed on the shafts of the rollers meshing with said helical wheels.

6. In an embroidering machine, the combination of several thread retarding rollers for threads of different stories, a brake disk fixed to one of the rollers, a brake block.

adapted to act on said disk, a spring adapted to press the block on to the brake disk, a lever adapted to put tension on the said spring, means for-fixing said lever in any desired position, a shaft having helical wheels and worms fixed on the shafts of the rollers meshing with said helical wheels.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

KARL KELLER. lVitnesses:

JEAN Serrano, CARL IVIEYER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

